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package org.jaberrio.personai2;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.TextView;

import java.util.Calendar;

public class DatePickerFragment extends DialogFragment
    implements DatePickerDialog.OnDateSetListener {

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current date as the default date in the picker
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    // Create a new instance of DatePickerDialog and return it
    return new DatePickerDialog(getActivity(), this, year, month, day);
}

public void onDateSet(DatePicker view, int year, int month, int day) {


    DataBaseManager dataBaseManager = new DataBaseManager();
    String date = String.valueOf(month) + "/" + String.valueOf(day) + "/" + String.valueOf(year);
    dataBaseManager.tempSaveCurrentEvent(DataBaseManager.FieldTypes.DUE_DATE,date, getActivity().getApplicationContext());

    TextView dueDate = (TextView)view.getRootView().findViewById(R.id.dueDate);
    dueDate.setText(dataBaseManager.tempGetCurrentEvent(DataBaseManager.FieldTypes.DUE_DATE,getActivity().getApplicationContext()));
}
}

日志猫：

06-23 19:04:05.451  13931-13931/org.jaberrio.personai2 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: org.jaberrio.personai2, PID: 13931
java.lang.NullPointerException
        at org.jaberrio.personai2.DatePickerFragment.onDateSet(DatePickerFragment.java:36)
        at android.app.DatePickerDialog.tryNotifyDateSet(DatePickerDialog.java:148)
        at android.app.DatePickerDialog.onClick(DatePickerDialog.java:116)
        at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5001)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
        at dalvik.system.NativeStart.main(Native Method)

我正在调用dueDate.setText() 但是它返回null。我调用 view.getRootView() 是因为我在 DatePicker 的视图中，因此它应该返回包含我的 DueDate TextView 的视图。我也可以从调用 DatePickerFragment 的方法中传递视图，但我不知道如何。我猜 DatePicker 视图在调用 getRootView() 时不会返回包含 R.id.dueDate 的视图。提前致谢。

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